In the process of orchid culture, the yellowing of leaves is prone to occur in spring and autumn. There are two main reasons for this. One is the yellowing of orchid leaves caused by natural fallen leaves, and the other is the inverted leaves caused by diseases. yellow. Natural inverted leaves belong to normal metabolism, and if it is a disease caused by inverted leaves, it should be treated in time. So, how do you distinguish between natural fallen leaves and fallen leaves caused by diseases in the process of breeding orchids?
First, natural inverted leaves
The new buds of orchids require a lot of nutrients, which is that some old leaves will "sacrifice" themselves and deliver their own stored nutrients to the sprouts. The characteristics of the inverted leaves caused by this metabolism are mainly the following:
1. The leaves will soon turn yellow, and it usually takes a few days from discovery to full yellowing.
2. There is no obvious boundary between the yellow and green orchid leaves.
3. When the leaves are yellow, there is no dehydration symptoms.
4. The leaves are all brown and dry at the end. When the leaves are gently touched, the leaves will naturally fall off from the petiole.
5, orchid leaf yellowing generally occurs on the old seedlings and leaves.
Second, the disease is inverted
1. Characteristics of fallen leaves caused by diseases
The leaves are necrotic and have obvious boundaries; the rate of necrosis is relatively slow; most of the fallen leaves caused by soft rot occur on the new seedlings, the leaves will lose their luster at first, then dehydrated and dry, gently Pull it up, but not at the petiole.
2, the law of incidence
High temperature and high humidity environment, planting knots, poor ventilation, prone to this disease, severe orchids will cause dehydration, lack of nutrition and death.
3. Prevention and treatment methods
Dispose of the blue plant wounds in time, and immediately apply the wound healing agent or broad-spectrum fungicide to the orchid to prevent infection.
It was found that the diseased plants were cut off and destroyed in time, and the planting materials and orchids used in the diseased plants were all discarded and replaced with new plant materials and orchids.
When breeding orchids, it is necessary to ensure that the culture environment is well ventilated, and the orchid basin should not be placed too densely.
At the peak of the onset, the drug is irrigated once every 15 days, and the plants around the diseased plants are sprayed with the roots and necks to protect them. The main control agent is 75% sodium sulfonate soluble powder 800-1000 times liquid, 25% prochloraz emulsifiable oil 800-1000 times liquid, and 70% methicillin WP 800 times liquid.
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